function GetXmlHttpObject()
        {
            var xmlHttp = null;
            try
            {
            // Firefox, Opera 8.0+, Safari
                xmlHttp = new XMLHttpRequest();
            }
            catch (e)
            {
            // Internet Explorer
                try
                {
                    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
                }
                catch (e)
                {
                    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
                }
            }
            return xmlHttp;
        }